Paint and varnish remover.



CARLETON ELLIS, OF LARCHMONT, NEW YORK, ASSIGNOR T0 CHADELOID CHEMICAL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF WEST VIRGINIA.

PAINT AND VARNISH REMOVER.

Specification of Letters Patent.

Patented June 15, 1915.

No Drawing. Original application filed February 26, 1907, Serial No. 359,509. Divided and this application filed August'd, 1907. 7

To all whom it may concern Be it known that I, OARLETON ELLIS, a citizen of the United States, and a resident of Larchmont, Westchester county, State of New York, have invented a new and useful Improvement in Paint and Varnish Removers, of which the following is a specification, this being a divisional application based on the disclosure of my application Serial No. 359,509, filed Feb. 26, 1907, which discloses and. claims the invention more broadly than this case, which is limited to removers comprising propionic acid in connection with various other components.

My invention relates to paint and varnish removers of an acid character and especially to those containing a volatile instead of a non-volatile acid so that when the coating of paint or varnish has been removed any acid remaining on the treated surface may quickly evaporate and leave the same in a fit condition for the application of a new finish coating. I

My invention is designed to provide an especially efficient remover for coatings containing readily decomposable paint pigments, such as the carbonates, among which white lead is the most noteworthy example When my remover is applied to such coatings the pigments are immediately attacked by the acid and rapidly disintegrated under the influence of the chemical action. In the case of carbonates this action is especially effective owing to the simultaneous mechanical disintegration of the paint or varnish coating due to the evolution and escape of carbon dioxid. The evolution of gas also increases the efiiciency of the neutral volatile solvents present to a marked degree as the latter are subjected toa continual agitation thereby, resulting in submitting the surface under treatment to all parts of the body of solvents alike.

For the purposes, of this invention I prefor to use propionic acid. This may be mixed with benzol or one or more substances allied thereto in their solvent properties such as the benzol homologues, including toluol, xylol and cumene; the petroleum hydrocarbons, such as benzin and kerosene; the chlorinated hydrocarbons. such as carbon tetrachlorid and chlorbenzol; the simple ethers such as methyl, ethyl and Serial No. 387,272.

amyl ethers, and compound ethers such as methyl, ethyl and amyl acetates; and carbon disulfid. Ethyl alcohol or one or more substances having similar solvent properties may also be added, such as methyl, amyl and denatured alcohols; the ketones, as acetone, methyl acetone, methyl ethyl ketone, acetone oil, butyrone and pinacolin; and light oil of hard wood tar. I preferably add a thickener of some kind to this mixture to retard the evaporation of the solvents, although I do not consider this essential. Among such substances that are useful in this connection may be mentioned wood fiour,,starch, whiting, infusorial earth, the soaps, the waxes and nitrocellulose. These thickeners when added are incorporated during agitation so as to secure as homogeneous a mixture as possible. Those thickeners which are soluble in one or more of the solvents are first incorporated in the solvents which dissolve them most readily.

An illustrative remover of this kind adapted for application in a thin layer to the surface being treated is: methyl acetone,

30 parts; benzol, 25 parts; propionic acid, 4parts, and ceresin wax, 1 part.

For dipping or tank work a remover of this character might be used with advantage: denatured alcohol, 40 parts; methyl ethyl ketone, 25 parts; propionic acid, 6 parts, and ceresin wax, part.

The stiflening material may be omitted altogether from this composition if desired.

Other solvents from the preceding lists, such as suitable proportions of one or more chlorinated hydrocarbons, ethers, esters and tar oils, might, of course, be added to or substituted in the above compositions. In some of these mixtures reaction probably takes place between the propionic acid and one or more of the other ingredients, though exactly what the reaction may be in each case is not certain.

WhatI claim and wish to cover by Letters Patent is:

1.' The finish remover comprising approximately denatured alcohol, forty parts, methyl ethyl ketone twenty-five parts, propionic acid, six parts, and ceresin wax'onequarter part.

2. Thefinish remover comprising approximately alcoholic finish solvent material pionic acid and incorporated thickening material.

6. The substantially non-aqueous finish remover comprising large proportions of composite volatile finish softening material including alcoholic finish softening 'material, a few per cent. at least of proprionic acid and incorporated thickening material.

In testimony whereof I have hereunto signed my name in the presence of two witnesses.-

OARLETON ELLIS.

Witnesses SAMUEL R. BELL, HARRY W. BROWN. 

